A-Rated Windows Swansea – Glass and Glazing. A-Rated energy efficiency of among the very best in uPVC Windows and Doors in Swansea, Port Talbot and the whole of North and South Gower Peninsula to West Glamorgan and South Wales. Choices of Planitherm or Pilkington Glass Glazing in double or triple glazed and choice of Argon or Air Cavity warm spacer bar and Veka frames.